1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. 4 * TsiChung Liew (Tsi-Chung.Liew@freescale.com) 5 */ 6 7 #include <common.h> 8 9 #include <command.h> 10 #include <rtc.h> 11 #include <asm/immap.h> 12 #include <asm/rtc.h> 13 14 #undef RTC_DEBUG 15 16 #ifndef CONFIG_SYS_MCFRTC_BASE 17 #error RTC_BASE is not defined! 18 #endif 19 20 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 21 #define STARTOFTIME 1970 22 23 int rtc_get(struct rtc_time *tmp) 24 { 25 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE); 26 27 int rtc_days, rtc_hrs, rtc_mins; 28 int tim; 29 30 rtc_days = rtc->days; 31 rtc_hrs = rtc->hourmin >> 8; 32 rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin); 33 34 tim = (rtc_days * 24) + rtc_hrs; 35 tim = (tim * 60) + rtc_mins; 36 tim = (tim * 60) + rtc->seconds; 37 38 rtc_to_tm(tim, tmp); 39 40 tmp->tm_yday = 0; 41 tmp->tm_isdst = 0; 42 43 #ifdef RTC_DEBUG 44 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 45 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 46 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 47 #endif 48 49 return 0; 50 } 51 52 int rtc_set(struct rtc_time *tmp) 53 { 54 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE); 55 56 static int month_days[12] = { 57 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 58 }; 59 int days, i, months; 60 61 if (tmp->tm_year > 2037) { 62 printf("Unable to handle. Exceeding integer limitation!\n"); 63 tmp->tm_year = 2027; 64 } 65 #ifdef RTC_DEBUG 66 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 67 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 68 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 69 #endif 70 71 /* calculate days by years */ 72 for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) { 73 days += 365 + isleap(i); 74 } 75 76 /* calculate days by months */ 77 months = tmp->tm_mon - 1; 78 for (i = 0; i < months; i++) { 79 days += month_days[i]; 80 81 if (i == 1) 82 days += isleap(i); 83 } 84 85 days += tmp->tm_mday - 1; 86 87 rtc->days = days; 88 rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min; 89 rtc->seconds = tmp->tm_sec; 90 91 return 0; 92 } 93 94 void rtc_reset(void) 95 { 96 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE); 97 98 if ((rtc->cr & RTC_CR_EN) == 0) { 99 printf("real-time-clock was stopped. Now starting...\n"); 100 rtc->cr |= RTC_CR_EN; 101 } 102 103 rtc->cr |= RTC_CR_SWR; 104 } 105